# Probable Error

The term probable error is seen only in older literature of statistics where it used to donate the product of the product of the standard error and a constant factor 0.6745, thus

Where P.E and S.E stand for the probable error and the standard error respectively, by using the above formula the probable error of any statistic may be determined if we substitute the standard error of that statistic. Hence, for example, the probable error of the correlation coefficient would be

Nowadays probable error is not in common use.